Analog Devices / Maxim Integrated MAX11311 & MAX11312 12-Port Mixed-Signal I/O
Analog Devices MAX11311 and MAX11312 12-Port Mixed-Signal I/O integrate a PIXI™, 12-bit, multichannel, analog-to-digital converter (ADC) and a 12-bit, multichannel, buffered digital-to-analog converter (DAC) in a single integrated circuit. These devices offer 12 mixed-signal high-voltage, bipolar ports, which are configurable as an ADC analog input, a DAC analog output, a general-purpose input (GPI), a general-purpose output (GPO), or an analog switch terminal. One internal and two external temperature sensors track junction and environmental temperature. Adjacent pairs of ports are configurable as a logic-level translator for open-drain devices or an analog switch.
PIXI ports provide highly flexible hardware configuration for 12-bit mixed-signal applications. The MAX11311 and MAX11312 are best suited for applications that demand a mixture of analog and digital functions. Each port is individually configurable with up to four selectable voltage ranges within -10V to +10V.
The MAX11311 and MAX11312 allow for the averaging of 2, 4, 8, 16, 32, 64, or 128 ADC samples from each ADC-configured port to improve noise performance. A DAC-configured output port can drive up to 25mA. The GPIO ports can be programmed to user-defined logic levels, and a GPI coupled with a GPO forms a logic-level translator.
Internal and external temperature measurements monitor programmable conditions of minimum and maximum temperature limits, using the interrupt to notify the host if one or more conditions occur. The temperature measurement results are made available through the serial interface.
The MAX11311 and MAX11312 feature an internal, low-noise 2.5V voltage reference and provide the option to use external voltage references with separate inputs for the DAC and ADC. The MAX11311 uses a 4-wire, 20MHz, SPI-compatible serial interface and the MAX11312 uses a 400kHz I2C-compatible serial interface. Both device interfaces operate from a 5V analog supply and a 1.8V to 5.0V digital supply. The PIXI port supply voltages operate from a wide range of -12.0V to +12.0V.
The Analog Devices MAX11311 and MAX11312 12-Port Mixed-Signal I/O are available in a 5mm x 5mm TQFN-32 package, The MAX11311 is also offered in a 7mm x 7mm TQFP-48, package. Both devices are specified over the -40°C to +105°C temperature range.
Features
- 12 Configurable Mixed-Signal Ports Maximize Design Flexibility Across Platforms
- Up to 12 12-Bit ADC Inputs
- Single-Ended, Differential, or Pseudo-Differential Range Options: 0 to 2.5V, ±5V, 0 to +10V, -10V to 0V
- Programmable Sample Averaging Per ADC Port
- Unique Voltage Reference for Each ADC PIXI Port
- Up to 12 12-Bit DAC Outputs
- Range Options: ±5V, 0 to +10V, -10V to 0V
- 25mA Current Drive Capability with Overcurrent Protection
- Up to 12 General-Purpose Digital I/Os
- 0 to +5V GPI Input Range
- 0 to +2.5V GPI Programmable Threshold Range
- 0 to +10V GPO Programmable Output Range
- Logic-Level Shifting Between Any Two Pins
- Up to 12 12-Bit ADC Inputs
- 60Ω Analog Switch Between Adjacent PIXI Ports
- Internal/External Temperature Sensors, ±1°C Accuracy
- Adapts to Specific Application Requirements and Allows for Easy Reconfiguration as System Needs Change
- Configurability of Functions Enables Optimized PCB Layout
- Reduces BOM Cost with Fewer Components in Small Footprint
- Package options
- 5mm x 5mm TQFN-32 (MAX11311 and MAX11312)
- 7mm x 7mm TQFP-48 (MAX11311 only)
Applications
- Base Station RF Power Device Bias Controllers
- System Supervision and Control
- Power-Supply Monitoring
- Industrial Control and Automation
- Control for Optical Components
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Development Tools
MAX1131x Peripheral Modules (Pmod™) provide the necessary hardware to interface the MAX11311 or MAX11312 12-channel programmable mixed-signal I/O devices. The modules can allow for interfacing to any systems utilizing Pmod-compatible expansion ports configurable for I2C communications.
MAX11311 Block Diagram
MAX11312 Block Diagram
